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+:import std/Combinator .
+:import std/Math .
+
+solve [|(sum-of-squares - square-of-sum)]
+ sum-of-squares ∑ (+1) → 0 | (\pow (+2))
+ square-of-sum (∑ (+1) → 0 | i) ** (+2)
+
+:test ((solve (+10)) =? (+2640)) ([[1]])
+
+main [solve (+100)]